{
    "target" : {
        "awsAccountId" : "xxxxxxxxxxxx",
        "awsIamRoleName" : "getMetricsWithCAA",
        "awsServiceNameSpace" : "AWS/RDS",
        "awsMetricName" : "CPUUtilization",
        "awsMetricsDemensionName" : "DBInstanceIdentifier",
        "awsMetricsDemensionValue" : "Zabbix",
        "awsRegion" : "ap-northeast-1",
        "Period" : 300,
        "Statistics" : "Sum"
    },
    "zabbix": {
        "zabbixManagerIpAddress" : "xx.xxx.xxx.xx",
        "zabbixManagerPort" : 10051,
        "targetZabbixHostName" : "ZabbixDB",
        "targetZabbixItemKey" : "aws.rds.cpu"
    }
}

from ZabbixSender import ZabbixSender, ZabbixPacket
import boto3
import datetime

# AssumeRoleして、一時クレデンシャルを取得する関数
def stsAssumeRole(awsAccountId, awsIamRoleName, awsRegion):
    # 1. AssumeRoleするためのClient作成、基礎情報の定義
    awsIamRoleArn = "arn:aws:iam::" + awsAccountId + ":role/" + awsIamRoleName
    awsSessionName = "CrossAccountZabbixSender"
    awsStsClient = boto3.client('sts')

    # 2. AssumeRole
    response = awsStsClient.assume_role(
        RoleArn=awsIamRoleArn,
        RoleSessionName=awsSessionName
    )

    # 3. 一時クレデンシャルの取得
    awsSession = boto3.Session(
        aws_access_key_id=response['Credentials']['AccessKeyId'],
        aws_secret_access_key=response['Credentials']['SecretAccessKey'],
        aws_session_token=response['Credentials']['SessionToken'],
        region_name=awsRegion
    )

    # 4. 一時クレデンシャルを返す
    return awsSession

# CloudWatch Metricsを取得する関数
def getMetricStatistics(awsSession, target):
    # 1. AWS CloudWatch用Clientを生成
    awsClient = awsSession.client('cloudwatch')

    # 2. eventで指定した監視ターゲットのメトリクスを取得
    ## getMetricStatisticsはUTCで時間指定する必要があるため、UTCタイムゾーンを生成
    UTC = datetime.timezone(datetime.timedelta(hours=0), 'UTC')
    ## StartTimeとEndTimeで期間を決め、getMetricStatisticsを実行
    metricStatistics = awsClient.get_metric_statistics(
                            Namespace = target["awsServiceNameSpace"],
                            MetricName = target["awsMetricName"],
                            Dimensions=[
                                {
                                    'Name': target["awsMetricsDemensionName"],
                                    'Value': target["awsMetricsDemensionValue"]
                                }
                            ],
                            StartTime = datetime.datetime.now(UTC) - datetime.timedelta(seconds=target["Period"]),
                            EndTime = datetime.datetime.now(UTC),
                            Period = target["Period"],
                            Statistics = [target["Statistics"]]
                    )

    # 3. metricStatisticsをdictごと返す
    return metricStatistics

# Zabbixにメトリクス値を送信する関数
def zabbixSender(dataPoint, zabbix):
    # 1. Zabbix Managerを示すオブジェクトを取得
    zabbixManager = ZabbixSender(zabbix["zabbixManagerIpAddress"], zabbix["zabbixManagerPort"])

    # 2. Zabbix Senderで送るパケットを作成
    zabbixPacket = ZabbixPacket()
    zabbixPacket.add(zabbix["targetZabbixHostName"],zabbix["targetZabbixItemKey"], dataPoint)

    # 3. Zabbix Senderでパケット(データポイント)を送信
    zabbixManager.send(zabbixPacket)

# lambda_handler
def lambda_handler(event, context):
    # 1. stsAssumeRoleを呼び、eventで指定したAWSアカウントから一時アクセスキー(awsSession)を取得
    awsSession = stsAssumeRole(event["target"]["awsAccountId"],event["target"]["awsIamRoleName"],event["target"]["awsRegion"])

    # 2. 1.で得たawsSessionを利用し、CloudWatch Metricsを取得
    metricStatistics = getMetricStatistics(awsSession, event["target"])

    # 3. 2.で得たmetricStatisticsからデータポイントだけを抜き出す
    dataPoint = metricStatistics['Datapoints'][0][event["target"]["Statistics"]]

    # 4. 3.で得たデータポイントをZabbix SenderでZabbix Managerに送る
    zabbixSender(dataPoint, event["zabbix"])

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